Figure 3
%Change (= Concentrationpost-hatched − Concentrationnon-embryonated × 100/Concentrationnon-embryonated) in elemental concentrations in the background colour and pigment spot regions of eggshells following embryonic eggshell etching, defined as non-embryonated and post-hatched eggshells of Black Grouse Tetrao tetrix and Capercaillie Tetrao urogallus. For the elemental concentrations and sample sizes, see Tables S2and S3. Note: The bars with positive values indicate elevated elemental concentrations following embryonic eggshell etching, whereas those with negative values indicate decreases within a given shell region. Note that because of some differences in eggshell elemental concentrations related to the origin of the eggs (see “Results”), the trend in %Change calculated within the sample of eggshells from wild and captive Black Grouse and Capercaillie retains the same direction, although the magnitude (bars) of %Change becomes smaller (after recalculation of the data from Tables S4 and S5).
